nations the '90s. >>> the fbi now thinks that border patrol agent may have died by friendly fire. nicolas ivey was shot and killed in california. initially officials said ivey and his colleague were wounded after responding to a censor. authorities say the only shell casings found at the scene were those belonging to the agents. >> as you know, investigators are made progress into the investigation into agent ivey's death andre looking into the possibility that it was a tragic accident. the result of friendly fire. the fact is the work of the border patrol is dangerous. all of us wear the uniform know this and yet this special creed of men and women willingly put themselves in harm's way to serve their country and to protect their communities against those who wish to do us harm. >> that news comes as homeland security secretary janet napolitano traveled to arizona to meet with officials and ivey's family. reacting to his death, napolitano said in part "this tragedy reminds us of the risks our men and women confront, the dangers they willingly undertake while protect our facing's borders.